You can add leagues, big or small, to Sports Club Stats.
   It's free.
   It's easy.
   Just email import@sportsclubstats.com the:
      structure
      schedule
      and rules
   In a few minutes you'll get back a link to the league.
   Play around, have fun, you won't break anything.
   I look forward to seeing what you create.

Info about the various settings:
   https://docs.google.com/document/d/1-UneDNk6tkOrc_B-WBnGnc5KGiy2kttXC2fW8dR7QzM/edit?hl=en

For example, here is what created this league:

LeagueBegin
  League: 6 Nations Championship (6 Nations Champ) (ID: 1a1hp) (Sort: League) (Playoffs: 0)
    Team: England                                  (ID: t1fck)
    Team: France                                   (ID: t1fcn)
    Team: Ireland                                  (ID: t1fcq)
    Team: Italy                                    (ID: t1fcr)
    Team: Scotland                                 (ID: t1fcx)
    Team: Wales                                    (ID: t1fd2)
  Kind: pro
  Sport: rugby
  Gender: male
  Country: International
  State: 
  Level: A
  Season: 2017 (current: True)
  Author: 
  Note: 
  LotteryNote: 
LeagueEnd

SortBegin
League: Points, GoalsDelta,  Wins, GoalsFor, GoalsFor HeadToHead, DrawLots
SortEnd

RulesBegin
  PointsForWinInRegulation:  4
  PointsForWinInOvertime:  4
  PointsForWinInShootout:  4
  PointsForLossInRegulation:  0
  PointsForLossInOvertime:  0
  PointsForLossInShootout:  0
  PointsForTie:  2
  PercentOfGamesThatEndInTie:  0.028
  PercentOfGamesThatEndInOvertimeWin:  0
  PercentOfGamesThatEndInShootoutWin:  0
  HomeFieldAdvantage:  0.653
  WeightType:  PercentOfPointsWon
  WeightExponent:  0.458
  WhatDoYouCallATie:  draw
  WhatDoYouCallLottery:  lottery
  WhatDoYouCallPromoted:  Championship
  Promote:  1
  PromotePlus:  0
  PromotePlusPercent:  0
  WhatDoYouCallDemoted:  Wooden Spoon
  Demote:  1
  DemotePlus:  0
  DemotePlusPercent:  0
RulesEnd

GamesBegin
TeamListedFirst: home
2/4/17    England    19-16   France     (ID: g1t2vp) (AwayBonus: 1)
2/4/17    Scotland   27-22   Ireland    (ID: g1t2vq) (AwayBonus: 1)
2/5/17    Italy      7-33    Wales      (ID: g1t2vr)
2/11/17   Italy      10-63   Ireland    (ID: g1t2vs) (AwayBonus: 1)
2/11/17   Wales      16-21   England    (ID: g1t2vt) (HomeBonus: 1)
2/12/17   France     22-16   Scotland   (ID: g1t2vu) (AwayBonus: 1)
2/25/17   Ireland    19-9    France     (ID: g1t2vv)
2/25/17   Scotland   29-13   Wales      (ID: g1t2vw)
2/26/17   England    36-15   Italy      (ID: g1t2vx) (HomeBonus: 1)
3/10/17   Wales      22-9    Ireland    (ID: g1t2vy)
3/11/17   England    61-41   Scotland   (ID: g1t2vz) (HomeBonus: 1)
3/11/17   Italy      18-40   France     (ID: g1t2w0) (AwayBonus: 1)
3/18/17   France             Wales      (ID: g1t2w1)
3/18/17   Ireland            England    (ID: g1t2w2)
3/18/17   Scotland           Italy      (ID: g1t2w3)
GamesEnd